Scarifier.



I. F. RIQHARDSON. SCARIFI'ER.

APPLICATION FILED MAR. 3,1916.

Patented Jan. 8,1918.

'2 SHEETS-SHEET I. F. RiCHARDSON.

SCARIHER.

APPLICATION FILED MAB. a. 1916.

1 25,5QQ Patented Jan. 8, 1918.

2 SHEETSSHEET 2- UEHTEE TATE PATENT @FFHJE.

JEFFERS F. RICHARDSON, OF BUFFALO, NEW YORK, ASSIGNOB. T0 BUFFALO STEAM ROLLER COMPANY, OF BUFFALO, NEW YGRK, A COBPQKATIONOF NEW YORK.

SCARIFIER.

Specification of Letters Patent.

Patented J an. s, 1918.

Application filed March s, 1916. Serial No. 81,878.

To all whom it may concern:

Be it known that I, Jnrrnns F. RICHARD- soN, of Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Scarifiers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention contemplates an improved scarifier adapted for attachment to road rollers.

In the accompanying drawing, Figure 1 is a sideelevation showin a portion of a road roller equipped with a scarilier embodying my invention. Fig. 2 is an end view, and Fig. 3 is a detail of one of the teeth heads.

I have illustrated the invention as applied to a road roller of the three wheel or macadam type. It is shown attached to the axle l of the left drive roll 2. In the form illustrated the scarifier comprises a frame 3 fulcrumed upon the axle 1 at the inner and outer sides of the roll 2 and extending forward and rearward of the roll. its ends, that is in advance and at the rear of the roll 2, the scarifier frame is equipped with teeth 4:, 5, the teeth 5 being adapted for operation when the roller is traveling forward and the teeth a when the roller is traveling rearwardly.

In the arrangement of the parts as shown in Fig. 1 the piston of the cylinder is at the central or neutral point and in that position of the piston and associated parts both sets of scarifying teeth are held well above the ground and in this position of the parts the han 'er 6 freely suspended from the frame of the machine operates both as a holding appliance and as a stop to prevent the piston moving beyond its central or neutral position and in a general way there is thus disclosed a fluid pressure device employing a piston that is capable of applying pressure to two different sets of teeth and further capable of holding both sets of teeth in neutral position.

In order to provide positive means for maintaining either of the sets of teeth 4 or 5 in operative position I have provided a motive fluid device 8. This consists of a cylinder having a piston 9 the rod 10 of which is connected to the teeth head 7. This At each of,

cylinder is shown formed with an inlet 12 above the piston and an inlet 13 below it. The steam, or other motive fluid which may be employed may be introduced through the port 13 and it will raise the piston and in consequence oscillate the scarifier frame 3 sufliciently to bring the set of teeth 5 into operative position. The regulation of the pressure of the motive fluid controls the e::- tent of penetration of the teeth. To reverse and employ the set of teeth 4 the fluid may be exhausted from beneath the piston and admitted through port 12 to force the piston downward and oscillate frame 3 sulliciently to reverse its position. The piston is capable of applying pressure on either set of teeth on either its upward or downward stroke.

I provide for regulating the angle of penetration of the teeth. Each of the teeth heads 7, 7 is bolted as at 14- to an extremity of the frame 3 and each of the teeth heads at its inner and outer ends is provided with a curved portion 15 having a plurality of apertures 16 therein as shown in detail in Fig. 3. Bolts 17 pass through any predetermined number of these apertures 16. By removing these bolts 17 the teeth heads may be turned on their bolts 1 1 and the teeth placed at the desired angle after which the bolts 17 are again inserted.

It will be manifest from the foregoing de scription of the arrangement of the fluid pressure device with the stop mechanism and the oscillating frame with the two sets of teeth at opposite points on said frame that by applying the fluid to the inlet 13 one set of teeth can be held with elastic pressure in the ground and by applying fluid pressure through the inlet 12 the opposite set of teeth can be held by elastic pressure in the ground and by the employment of a hanger 6 having the slot therein to cooperate with a pin on the teeth head 7 the piston may be stopped and held in its neutral position shown in Fig. 1, it being apparent that in that position of the hanger 6 the piston cannot be moved upwardly or downwardly beyond its central position until the hanger 6 is oscillated to cause the slot to release the pin on said head 7. The hanger 6 thereby acts as a stop for holding the piston against movement in either direction. If it is desired to apply the teeth 5 to the work or ground the hanger 6 will have to be oscillated. out of locking position and the piston head can then be moved upwardly or downwardly past the neutral or central position.

I claim'as my invention:

1. In a road roller, a reversible scarifier comprising two sets of teeth arranged to Work reversely one to the other, in combination With a fluid pressure device comprising a cylinder piston arranged-to hold yieldingly one set of teeth When the piston is moving in one direction and the other set' of teeth when the piston is moving in the opposite direction, andmeans for holding the piston against movement 111 its central or neutral position for the purpose specified.

2; In a road roller, a reversible scarifier comprising a plurallty of sets of teeth, one set of teeth belng arranged to Work in a direction reversely to the other set, a fluid pressure device for holding either set of teeth at Work including a pistonarranged'in onedii-ectionof'itsmovement to hold one Set of teeth at Work and in the other direction of its movement to hold the other set at Work and a manually controll'edystop for holding the piston against any movement beyond. the central and neutral position for the purpose specified.

In testimony whereof, I: have signedthis specificationin the presence of two subscribing Witnesses.

J'EFFERS F. RICHARDSON.

Witnesses:

Uno 'V; SGHAUROTH, H. J. HARRISON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

